KR19980040813A - Stepping motor control method according to external condition - Google Patents

Abstract

end. The technical field to which the invention described in the claims belongs

It relates to a stepping motor control method according to external conditions.

I. The technical problem to be solved by the invention

Control the stepping motor to operate normally even if the external conditions change.

All. Summary of Solution of the Invention

If the external conditions required for the stepping motor require high-speed rotation and a large amount of torque, increase the supply current to the stepping motor and set the driving method to 2-2 phase.If the low speed and low torque are required, the supply current is reduced and driven. It characterized in that the stepping motor is driven in a 1-2 phase method.

la. Important uses of the invention

Used in equipment with stepping motors.

Description

Stepping motor control method according to external condition

The present invention relates to a motor control method, and more particularly to a stepping motor control method.

Typically, the driving of the stepping motor is set to be driven constantly regardless of changes in speed and load. Accordingly, if the speed of the stepping motor, the load of the stepping motor, and the moving distance of the stepping motor change when the stepping motor is driven, the stepping motor causes abnormal operation such as noise generation or stepping out.

In the following description, in order to show an example in which the stepping motor abnormally operates as the driving environment of the stepping motor changes, the driving of the stepping motor mounted in the inkjet printer will be described as an example.

The stepping motor used in the inkjet printer is driven constantly regardless of speed and load changes. That is, the conventional method of driving a stepping motor is to supply 100% of the current that can be supplied to the coil of the stepping motor to the coil of the stepping motor in a 1-2 phase manner.

The step of driving the stepping motor in the inkjet printer can be divided into four categories. That is, printing in the draft mode, printing in the maintenance mode, printing in the LQ mode, and moving in a short interval.

Now, the torque and speed required for the stepping motors in the four cases will be described, and the problems that may be caused by the constant driving of the stepping motors will be described.

Firstly, printing in the drift mode required a large torque and high speed on the stepping motor. At this time, the stepping motor takes a lot of load, and there is a risk of stepping out if not properly controlled.

Secondly, printing in maintenance mode required the largest torque and low speed rotation of the stepping motor. At this time, too, the load on the stepping motor, there is a risk of out of step if not properly controlled.

Third, to print in Elcu mode, the stepping motor required small torque and stable rotation. Accordingly, if the stepping motor generates more torque than necessary, noise may be generated.

In addition, when the stepping motor moves in a short section, the load acting on the stepping motor is small, and low-speed rotation is required. Accordingly, when the general driving method is applied, a lot of noise may occur.

The above problems can be solved by developing a stepping motor that operates ideally under all conditions in order to prevent abnormal operation from occurring. However, developing a stepping motor as described above is very difficult and time consuming. It's work.

As described above, the conventional stepping motor control method is driven in the same manner regardless of external conditions. Therefore, there was a problem causing abnormal operation as the external conditions change.

Accordingly, an object of the present invention is to provide a stepping motor control method according to an external condition for controlling the stepping motor according to the external condition so that the stepping motor operates normally even if the external condition changes.

1 shows a stepping motor control apparatus according to external conditions according to a preferred embodiment of the present invention.

FIG. 2 illustrates the stepping motor unit of FIG. 1 in detail.

3 is a flowchart illustrating a stepping motor control method according to external conditions according to a preferred embodiment of the present invention.

According to the present invention for achieving the above object, if the external condition required for the stepping motor is a condition requiring high speed rotation and a large amount of torque, the supply current to the stepping motor is increased and the driving method is 2-2 phase, When the torque is required, the stepping motor is driven by reducing the supply current and setting the driving mode to 1-2 phase.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description and the annexed drawings, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent to those skilled in the art that the present invention may be practiced without these specific details. And a detailed description of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted.

Hereinafter, an example in which the present invention is applied to a method for controlling the driving of a stepping motor in an inkjet printer having a stepping motor will be described.

1 is a block diagram of a conventional stepping motor control apparatus. The controller 10 shown in FIG. 1 may be a central processing unit (CPU) of an inkjet printer, or may include a separate controller 10. The controller 10 provides the control signals I1, I2, I3, and I4 to the stepping motor controller 14. The control signals I1 and I2 are control signals for controlling the A phase current of the stepping motor 14. The control signals I3 and I4 are control signals for controlling the B-phase current of the stepping motor 14.

FIG. 2 shows a detailed circuit diagram of a conventional stepping motor control unit 12 that controls the magnitude of the current supplied to the stepping motor 14 in accordance with the control signal as described above. The first and second stepping motor control elements 16 and 18 of the stepping motor control unit 12 shown in FIG. 2 use a stepping motor control element PBL 3717 already widely used.

The first stepping motor control element 16 controls the current flowing in phase A of the stepping motor 14. That is, the first stepping motor control element 16 adjusts the amount of current to be input on A of the stepping motor 14 according to a signal input to the input terminals I1 and I2 of the first stepping motor control element 16. . The amount of current is proportional to the torque of the stepping motor 14.

That is, by controlling the signals input to the input terminals I1 and I2, the amount of current flowing on the A phase of the stepping motor 14 can be adjusted.

Control signals I1 and I2 of the control unit 10 are input to the input terminals I1 and I2. Here, the amount of current flowing in phase A of the stepping motor 14 according to the state of the control signals I1 and I2 provided by the controller 10 will be described.

Table 1 shows the relationship between the states of the control signals I1 and I2 and the amount of current flowing in the A phase of the stepping motor 14.

I1 I2 A phase current size low low 100% of applied current low Hi 60% of applied current Hi low 30% of applied current Hi Hi No current applied

As shown in Table 1, the magnitude of the current in phase A may be adjusted according to the control signals I1 and I2.

The second stepping motor control element 18 controls the current flowing in phase B of the stepping motor 14. That is, the second stepping motor control element 18 adjusts the amount of current to be input on the B of the stepping motor 14 according to a signal input to the input terminals I3 and I4 of the second stepping motor control element 18. . The amount of current is proportional to the torque of the stepping motor 14.

That is, by controlling the signals input to the input terminals I3 and I4, the amount of current flowing on the B of the stepping motor 14 can be adjusted.

Control signals I3 and I4 of the control unit 10 are input to the input terminals I3 and I4. Here, the amount of current flowing in phase B of the stepping motor 14 according to the state of the control signals I3 and I4 provided by the controller 10 will be described.

Table 2 shows the relationship between the states of the control signals I3 and I4 and the amount of current flowing in the B phase of the stepping motor 14.

I3 I4 B-phase current magnitude low low 100% of applied current low Hi 60% of applied current Hi low 30% of applied current Hi Hi No current applied

As shown in Table 1, the magnitude of the current in phase A may be adjusted according to the control signals I1 and I2.

As described above, the stepping motor controller 12 controls the magnitude of the current provided to the stepping motor 14 according to the control signals I1, I2, I3, and I4. Since the circuit configuration of the stepping motor control unit 12 shown in FIG. 2 is conventional, detailed description thereof will be omitted.

As described above, the process of controlling the stepping motor 14 in the inkjet printer by controlling the control signals I1, I2, I3, and I4 of the controller 10 will be described in detail.

3 is a flowchart illustrating a process of the control unit 10 for performing the control of the stepping motor 14. Step 20 of FIG. 3 starts when the motor is driven in the inkjet printer. In step (20), the controller 10 searches whether the inkjet printer is driving the stepping motor 14 by printing in the draft mode. At this time, the control unit 10 performs step (30) when the draft mode printing, and performs step (22) when the draft mode printing. In step (22), the control unit 10 searches for maintenance mode. At this time, the controller 10 performs step 30 in the maintenance mode, and performs step 24 in the maintenance mode. In step 30, the controller 10 drives the stepping motor 14 by supplying a 2-2 phase, 100% current.

The reason why the stepping motor 14 is driven with a 2-2 phase and 100% current as described above is that a large amount of torque is required in the draft mode and the maintenance mode.

In order to drive as described above, the controller 10 outputs the control signals I1, I2, I3, and I4 all low. When I1, I2, I3, and I4 are all low, the currents of phase A and phase B are 100%. Then, the current is supplied to both the A and B phases, thereby driving the 2-2 phases.

4 illustrates this. As shown in FIG. 4, I1, I2, I3, and I4 are all low. In interval 1, I1, I2, I3, and I4 are all low. Accordingly, 100% current is applied to both A and B phases. At this time, phase A and Since the phase is high, the driving phase of the stepping motor 14 is A, Becomes In interval 2, I1, I2, I3, and I4 are all low. Accordingly, 100% current is applied to both A and B phases. At this time, since the A and B phases are high in the section 2, the driving phases of the stepping motor 14 are A and B. In interval 3, I1, I2, I3, and I4 are all low. Accordingly, 100% current is applied to both A and B phases. In this case, B and Since the phase is high, the driving phase of the stepping motor 14 is B, Becomes In this process, the driving phase of the stepping motor 14 is A, ⇒ A, B ⇒ B, ⇒ , ⇒ , A… To change. The above change in driving phase means driving of 2-2 phases.

On the other hand, in step (24), the control unit 10 searches whether the stepping motor 14 is driven for Elcu mode printing. At this time, the control unit 10 performs step (26) if the stepping motor 14 is driving for Elcu mode printing, otherwise it is driving a certain period of time not to print, in this case (28) Perform.

In step (26), the control unit 10 drives the stepping motor 14 with a 1-2 phase, 100% current supply. The driving of the motor in this way is because the printing of the Elcu mode requires low speed and low torque, so that stable motor driving must be performed.

The controller 10 generates the control signals I1, I2, I3, and I4 as shown in FIG. 5 to perform the 1-2 phase and 100% current driving. Since I1, I2, I3, and I4 shown in FIG. 5 do not alternately supply or supply currents of A phase or B phase, driving of 1-2 phases is performed.

That is, in section 6, since I1 and I2 are low, the current is supplied to the A phase 100%, and since I3 and I4 are the low, the current is not supplied to the B phase. At this time Wow Is high, but the current is Is supplied only to the driving phase of the stepping motor 14 Becomes In the interval 7, since I1 and I2 are low, the current is supplied to the A phase by 100%, and since I3 and I4 are low, the current is supplied to the B phase by 100%. At this time Wow Is high, the driving phase of the stepping motor 14 is , Becomes In the interval 8, since I1 and I2 are high, no current is supplied to A phase, and since I3 and I4 are low, 100% current is supplied to B phase. Where A and Is high, but the current is Is supplied only to the driving phase of the stepping motor 14 Becomes In this process, the driving phase of the stepping motor 14 is ⇒ , ⇒ ⇒ , A ⇒ A. To change. The change in driving phase as described above means driving of 1-2 phases.

In operation 28, the control unit 10 drives the stepping motor 14 to 1-2 phase, 60%. Driving as above is for low speed and low torque of the motor.

In order to drive the stepping motor 14 as described above, the controller 10 generates the control signals I1, I2, I3, and I4 as shown in FIG. Since I1, I2, I3, and I4 shown in FIG. 6 do not alternately supply or supply currents of A phase or B phase, driving of 1-2 phases is performed.

That is, in section 11, I1 is high and I2 is low, so that 60% of the current is supplied to A phase, and I3 and I4 are low, so that current is not supplied to B phase. At this time Wow Is high, but the current is Is supplied only to the driving phase of the stepping motor 14 Becomes In the period 12, since I1 is high and I2 is low, 60% of the current is supplied to A phase, and I3 is high and I4 is low, and 60% of current is supplied to B phase. At this time Wow Is high, the driving phase of the stepping motor 14 is , Becomes In the period 13, since I1 and I2 are high, no current is supplied to the A phase, and since I3 is high and I4 is low, 60% of the current is supplied to the B phase. Where A and Is high, but the current is Is supplied only to the driving phase of the stepping motor 14 Becomes In this process, the driving phase of the stepping motor 14 is ⇒ , ⇒ ⇒ , A ⇒ A. To change. The change in driving phase as described above means driving of 1-2 phases.

Therefore, in the present invention, the driving method and the supply current are different according to externally required conditions. As a result, the motor does not operate ideally because it adapts to external conditions.

As described above, the present invention drives the stepping motor according to an external condition, so that the stepping motor may operate normally even when the external condition changes.

Claims (2)

In the stepping motor control method according to the external conditions, If the external conditions required for the stepping motor require high-speed rotation and a large amount of torque, increase the supply current to the stepping motor and set the driving method to 2-2 phase.If the low speed and low torque are required, the supply current is reduced and driven. Stepping motor control method according to external conditions, characterized in that for driving the stepping motor to the 1-2 phase method. In the stepping motor control method according to the external conditions, An external condition search step of searching for an external condition required for a stepping motor; A high speed driving step of supplying all of the supplyable currents and driving the stepping motor with 2-2 phases when the external condition requires high speed rotation and a large torque; A low speed driving step of supplying a small current when the external condition requires low speed rotation and a small torque and driving a stepping motor with a 1-2 phase driving method; Stepping motor control according to external conditions, characterized in that if the external conditions require a safe driving step of supplying 100% of the supplyable current and the driving method is a 1-2 phase for driving the stepping motor Way.